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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4a111cfd3e23de9f001c023663a7fe68cd7bec5fa5e24bd91772af7bdbe1bf4' 
  AND token = 'L9MNCEClMLz/xWP7vv09F/F4QMIEf3wB5kJDg4zGifU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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