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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6a04bab7ff1c8ba38337379db8754357aaaec9aa85bc0edcfced7030eb99bc0' 
  AND token = '+jP/ps58zg2l2nyHfH9KMxwItP17ZliRmqAOd/iJaO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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