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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63f210ff2c355b82d8e343fa0d1c9b2c6b8ef1372939c472fcabf28579dfdfdb' 
  AND token = '+fbwdScuwsadzDKpWnD0Cc9gYXk4KyF0GW0/TKhpazo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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