SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b22c1dda5b53ea38f7bf24b46f6ee095e4541c26b099a0b2b7212b385d3691a' 
  AND token = 'XLJms56ulyk+TRAP2BYJ09zR4pSDpsvoKmGepqBMiow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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