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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88733044a3c0f421c904d6da3ce60c4dd8c9d2733d8718087a7c07c25be472c0' 
  AND token = '3OGEo9YPwG1dvnBUb86CnEyzW4wkCTPLCS1ilypvqVI=' 
  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"
    }
  }
}