Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afc46c2de5da847cc171deadbd479e5f0c933dc2cf7d7e9c4280c7f848694757' 
  AND token = 'HBC5hll17xe6rVQmQkZturLT5pivsOc4bcbEe0qtbw4=' 
  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"
    }
  }
}