SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5db70d5d141a74734c5a263198b89933af6693205e830f9199c1f49730f299a9' 
  AND token = 'XpEK6I8qDegy/N6GBPjzoqARrSy//9gTEUoZGsRLOu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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