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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d2583bb7af045b60165aba4700b8d3cbfb1b59ee70b0fc1edfabe2438145849' 
  AND token = 'osgh6neqAVt/TOVdm1+p1xueImuol6P2WvGTLMK2fqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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