Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf975597edf7b673ac40432beb8edfc5add283bf533cda66ebe483472fa79c2a' 
  AND token = 'r69RxqvbL+7IegpXnqnf+Il7FiIfDSimWwfekeewFFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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