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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3eef3002fa2b07108b22a3791020e3a3f57f30fb0d5edf4cff6318186734405' 
  AND token = 'HMLCaU9wxvoU7lEdM9tRBzOEOwlgTdDhEnk7Kq2Dpzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}