SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ece04217bfddb3250e2b19f8a64c153c45957317f176ccb05103bccd93b1e8e2' 
  AND token = 'JiR6RgJZsMBJVrp5CIuVBknYwwdF5yiDZ9/lE3vBZlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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