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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84cf8e0596f35e311d6cff7e2f70744dc8c3cad544acfd76d9da4b140e9a3282' 
  AND token = 'njwQbhPRJFIA5D90M+Eo5MlFFjAePS4pD5XLUtmT57w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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