SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3061725f1f60a25fc5461243833054615b2f893ad7ee7c3ceb310d9fceeef006' 
  AND token = 'Y5K3NzhQwuGRNeXHwz1UInbSIBdDqJGgl9OKg6j5mhc=' 
  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"
    }
  }
}