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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f31a42c5e929b5cfc258b67c54f40e3d9778d593846a6d7acf0a4e34c86f3f1b' 
  AND token = 'IYBY0YFft8zaYAnHUG3enhZr0+BoZCyQ0cb5RWxJ9uU=' 
  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"
    }
  }
}