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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad51880fff13be973326fd620f18d701f869c12fdfe5be7a86a2ea68b97a1709' 
  AND token = 'nva0sxZfXgggn1h9Y0csRQjEYOiqK7mybfo3keT7J3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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