Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c16806ba5870989469442b967fde80111d115bd4f6b29378fb961dc1a0247a13' 
  AND token = '+p0gWVrpft7iucY3TsKPuzLM5j4AcyyzuyKPB2/XbrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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