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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ecaa396e939a91ad162005759126763fb2647f7c20c4688e7d22e84d27c9c83' 
  AND token = 'wlgnT5X3FJW/6wNb//AOsBhzy7n6JIij7jPrV/e1bjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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