SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd4dd58f7ba21d6ffef78818a5f49f15007c922993ff216059e565b912f2718e' 
  AND token = 'qqgVRV0jvbDFRKM1GaSw3h8r3mc3Fqls/n8yi4Jyr8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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