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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9a56b1bb9b53be5ee1ea8627d0e2e44855f89f765a36d5ab032e1c3ae8ccbbf' 
  AND token = 'z3LH29rSX9I4CAXNA88AgCeQ7Js+Qpp8tcGJxmwXZlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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