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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ac8e6e46c4e15eb6227702e9f06f0a7ed359b9f1dfae93bf7a92c556b872c17' 
  AND token = 'UBg5PHO/5IDSvdn5WZtH/VhAEwy/I6lrgcUUGWcAox8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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