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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '120ddbe6fec5d108692b1ea84fe92066047362611623ac3e226ae36336cd605c' 
  AND token = 'iFrQx95Nh8mm5HXVm6jpNfhKj3tozoTTaSkBY1lelNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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