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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cff48df1409efab2d438ae028a619cba4029a020465250a46f9c7d92e3ab549' 
  AND token = '6mIErjZXsfVTWbeMgX3Zd1Y6SzGKmQSF+X6Y2mayAWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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