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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9db4a6b3def6520c04c00a8d0418766bacdd9ebf5560e8889cbe50a965ba83ba' 
  AND token = '4RUH1Vduy7Kkz7QbAmnzz3sxTyrYZIeNHchKBREtrM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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