Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e8a5bd1829d06cea01d9c56af186c1e269ceece33c3fe318d2f120cca87c502' 
  AND token = 'NCtXBJIGACHom4qpQ3VU28690xQiM+CtaoocwIG7orY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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