Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '906f10ef65300b24d2e3a38d0435ea4d5799bed15afb038e291da5f48c1a4a8a' 
  AND token = 'R/tesMIzZl0CSG2rsTKghejuo25VhHY/EFOr5LZKVZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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