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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f095c2186ae1904d66be1077944666c7d4a2fb72ae2afe3c2c03f6ae06e238d6' 
  AND token = 'ejS0EG46s0WidhflUUg+kily+1Wkrj2a4i+sQ21VoDo=' 
  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"
    }
  }
}