Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d862ae399d2364bfba63993d2563e18384976942cb23dc62dc5923d3a6a993f' 
  AND token = '/zffnsPJ5auvJrk3g20A+R8AtADm5HOWUSAGWTwSgsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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