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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee63f255de36518d2812fe7c95ba016eb4c7f763e6b74beb6111de602e77b2c2' 
  AND token = '6ben1z3y3JR446KCrDs2csgHkvJK5iqRXAHzG2CjFpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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