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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34f4adf4c109cc543fbccf899c3c8f280a3d26c647c3d83bd6674e555e4efebb' 
  AND token = 'Put5N0aAyHOiSGuG0RrWs6XFRFa5vq97mjrFBd4XiSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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