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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b0bd86e91a17a3710fb9b56c4c371a536b6dce4859e5cb39e0aea9940c55765' 
  AND token = 'VKeZBd824/roT9V7hCiFsw9x2DeKYKPrc89otJeX4LM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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