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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a6d7bf36086c6e465e0c0894f22b4eca6cb0e947d56a60a4d7840b094465f97' 
  AND token = 'IrQjYqyS5JaI+ke9AfvkqJBbbHBhGJfRB8Hp23f3nCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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