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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6717cba9fa1e44f810d94820e9a87300b09c8f23700e5e48c9a304bebd57335f' 
  AND token = 'ffELrEXb/BsXoKRzWO2xtE4YMfr6RaSLolVjI/lT4dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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