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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd63628577ea4f09a39ee6834f8bef3e9bbd0b7712d896559a66dd9985d5b0800' 
  AND token = '1zlsY2qapS+Hrf4eABi6GSBO5R+fqlC/6g7LkGWlq7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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