Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff72795947f0cadbb7a8398a86e37a426c1cafbf57fba12cc93adef65c33570e' 
  AND token = 'r/jkBFYND+CokTlESR1LyA/So4wgWqFIiMLHaUdHkHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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