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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8090a5b7d1451fd08eb77aca146ded11039575f6f60c908e73968b14b9159546' 
  AND token = '/ZR4aY3XyOYccw3QTvdivZivD0t5o9OPL/QwA8GRTUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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