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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ca4ee0becd080d88de81cf80fc8b788581c1f945f8bd0bc1520b96bc905e73d' 
  AND token = 'sIvFohIIExvkhNjzosJ14Tn5l12Qe2o7IXETtmvwLv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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