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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a608302ce63a922deb850bfedb7c18d0abb256e68a22086a8515618ef2d17089' 
  AND token = '/r274iSt8HDTPBuLv8WtEFnEswuMZ05hAOs9S2BwbOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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