Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6b0d9da593cdcb0f4f6edd8c8e22697fc88cb9280bd0b17535ab5d52c24512c' 
  AND token = 'fYlFPGJTz1KvFAq+8cLuP+Oc1hfKTZQxKCX2APS1DcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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