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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3254d8269d352a100ffd3699ce37f95f23716ad859873d790df3532622fb3eea' 
  AND token = 'hVa3Nr1y4C271b6bUbuIZcGBQ9bkg9Aufa5eqkdjUv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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