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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b4cabc701b107aa8516f7fee9d5bed311680324d683080b7dbc135029fec087' 
  AND token = 'dUX3NCc3W9o398V1xIJtj3ZwpYU1YiO0Hp7AM0ABbeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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