Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '167ca4c1566d2fa7a7927eafe358efbebc79f16cfa10ad6c8177b1d70adc8a52' 
  AND token = 'qvX+YwDprRD/HV7KESrzRPl7rb2LMVsSDgHbMkjn9hA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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