Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfd8fd0dfa0988002a78708764caa836931cb2e93bce7403ce56b63cbc61d7eb' 
  AND token = 'ZZGM78MObjrThgH0NoRnfUvrfyVtyQzkB0krcETENog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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