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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de78889476ec3868e248a6e5013c186b46a53ea0d96ee6f2f65c5e1f8f89c69d' 
  AND token = 'm0Z8T3tTIO9Y6wKYnixnCgrC3qsK/ZeHFktYxF9TcV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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