Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50b3fea62362ff5331713087ebc8faa834f49e62ed1f849985f5db5da9974fdb' 
  AND token = 'nHA9WF/UcnBT4NoAyBbfXVH4in5eTTSZE4ZcRhUaf0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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