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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f89dbf0549b0ab13d247406ff0aae81cd9cbdaaf7e657fd9e93c65fe85d8e31' 
  AND token = 'tU7OgVeyPZ+gOZG3sL6fJ3bapkFfgReksSU14CnE/lo=' 
  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"
    }
  }
}