Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3f3960ac23f254b0518982ce129ee803db22c6396e4a393cf2738ee51d01414' 
  AND token = '/hS7/shAIs59D2MOPEQwAOqIBuNrtVPwS0DgneBMpj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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