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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f2fef30bb802c85fef58c81a61d841ffa6d47c8da105ed68de304282869e292' 
  AND token = 'bCcDpQtZdN6aCyG3LF7AbYpB+IlBuxy91NY0+7Wnoas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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