Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '517359848838a00189bbd0190b256a8f06fa2a9077277897e167f2134f19ae54' 
  AND token = 'vPdMM4GaUTDzgwGUKwk1rbJRJjLOYUFvk2ks8kfAiB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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