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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1b5bbb6f1c3fc9f2c899f710b07517e69af7a9d8943724accc525166480f8f9' 
  AND token = 'A85sYqfHG1RDSAwt8VCcKsBcCHVf2goZJ6A6jokrPEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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