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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5908e75bbd026c99edeaeaf9428a971410d8780ff3183aeb153b76fc8e5953a' 
  AND token = 'DFxJrg2pm7lW8fOcb1rqErHAbfX9H+D8QWZMmVBewN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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