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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23c60cb8ce3fd69a45ec58f192c3992ec8c28e451e58d21d82db595f023e6d77' 
  AND token = '7z1nE7VTPDKuPk+Hvup7XJFPvPRu6CZTkl5ElameI9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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