Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eb6c45d15a9db029ae09e64a40b7cde8013357f358bf1aa2b6f3b051b466359' 
  AND token = 'sB6PRt73feXcPYpDsXHG0Td6/QiEUUQE8qij6f+xeFE=' 
  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"
    }
  }
}