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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb1d34d6803431b552c5b9e3892a48c4f779e650a9cf70929ead19b6185531f6' 
  AND token = 'rST+HE6AuglT9ja0Ot6mBpZuZL3+Ad9gC6a2EagGTfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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