SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d5eeb55f0a6f902274406befbdc219ecccb790d71b88befeb81a3f227897597' 
  AND token = 'v/ThJvmbqzZHVUik9J1s48dRjVHF/0MbBaf1w5wZMBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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