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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '583f8368e7bfb7c0e421f0a75144b848bc9ded548adb9e2064ca565da974541d' 
  AND token = '0tHgAhSmrpxB9Bb1v8R7nSLTI776BdZ3JYtVyWmDZkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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