Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd891f2f98bda531d5698703ce84c4194a20dfeb59aa1796b90bff3c0983ac418' 
  AND token = 'ZZ8QUX3Tv2/NtasDMnWibZuTZfSWOU60JtMDydogXlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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