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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ed5529b4cf9e8f68fba8d1160bbd76b44d19bae8dcabf5f8146c76d4cc35e74' 
  AND token = 'fxn3y9FBkiD5bOzeWnd/nL3aK/d4hUWFkz4YhXh+J6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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