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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66be41a9b5fe9a72ffe19f12db4f26cf1f61070faa649e5b525493c0520f944a' 
  AND token = '/u6CgZHuiJZixzIW38v6J02NpVg8ZuzyMOZicCCVdtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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