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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58c86d69ce86407094161c20c37d9520ba9964b56db57f481e78fb3cfddfc3e4' 
  AND token = 'EEKwTGfzJ3oTT5qdCtirZxKnpWUioT1TfylFqyPV7EQ=' 
  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"
    }
  }
}