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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eed0dfec105df02d5ff1c5f8c7d923cdc7bdcffeaa04819a8047589220f1362' 
  AND token = 'L+s/kMidSC6wIyZmWQmx0Ekxw2TQ2fzWUawurrU6JSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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